Softening and good ductility for nanocrystal-dispersed amorphous Fe–Co–B alloys with high saturation magnetization above 1.7 T

Han, Ye; Inoue, Akihisa; Kong, F.L.; Chang, Chuntao; Shu, Su-Jeong; Shalaan, E.; Al-Marzouki, F.

doi:10.1016/j.jallcom.2015.10.066

Cited by 47 publications

(16 citation statements)

References 34 publications

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“…Boron was added in the form of a pre-prepared FeB alloy with the chemical composition Fe 45.4 B 54. 6 . The production process was carried out under a protective atmosphere of argon.…”

Section: Methodsmentioning

confidence: 99%

“…The alloy with an atomic content of Y = 10% was characterized by the highest saturation magnetization value and the lowest value of the D spf parameter, which may indicate the occurrence of antiferromagnetic ordering in certain regions of this alloy sample.produced in the form of thin ribbons, using the melt-spinning method [4], present particularly good properties. Materials of this type are characterized by a high value of saturation magnetization (above 1.5 T) and a low value of coercive field (approximately 1 A/m) [5][6][7][8][9]. These material samples are extremely easy to magnetize, partly due to their dimensions.…”

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confidence: 99%

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The Process of Magnetizing FeNbYHfB Bulk Amorphous Alloys in Strong Magnetic Fields

et al. 2020

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The structure of amorphous alloys still has not been described satisfactorily due to the lack of direct methods for observing structural defects. The magnetizing process of amorphous alloys is closely related to its disordered structure. The sensitivity of the magnetization vector to any heterogeneity allows indirect assessment of the structure of amorphous ferromagnetic alloys. In strong magnetic fields, the magnetization process involves the rotation of a magnetization vector around point and line defects. Based on analysis of primary magnetization curves, it is possible to identify the type of these defects. This paper presents the results of research into the magnetization process of amorphous alloys that are based on iron, in the areas called the approach to ferromagnetic saturation and the Holstein-Primakoff para-process. The structure of a range of specially produced materials was examined using X-ray diffraction. Primary magnetization curves were measured over the range of 0 to 2 T. The process of magnetizing all of the tested alloys was associated with the presence of linear defects, satisfying the relationship D di p < 1 H . It was found that the addition of yttrium, at the expense of hafnium, impedes the magnetization process. The alloy with an atomic content of Y = 10% was characterized by the highest saturation magnetization value and the lowest value of the D spf parameter, which may indicate the occurrence of antiferromagnetic ordering in certain regions of this alloy sample.produced in the form of thin ribbons, using the melt-spinning method [4], present particularly good properties. Materials of this type are characterized by a high value of saturation magnetization (above 1.5 T) and a low value of coercive field (approximately 1 A/m) [5][6][7][8][9]. These material samples are extremely easy to magnetize, partly due to their dimensions. Amorphous ribbons have thicknesses of up to several tens of µm. Unfortunately, these dimensions significantly limit the applications of these materials. The so-called bulk amorphous alloys comprise a relatively new group of promising materials. These materials are produced by a rapid-quenching process in copper molds. The most well-known production methods are the injection-and suction-casting methods [10,11]. In this way, at a cooling rate of 10 −1 -10 3 K/s, iron-based alloys with dimensions exceeding 10 mm can be produced [12][13][14]. However, due to their high proportions of non-magnetic component elements, such as: B, C, Zr, Y, Mo, Nb, Hf, or Cr, these alloys do not exhibit the best magnetic properties. A compromise that combines relatively good magnetic properties (saturation magnetization greater than1T, coercive field less than 50 A/m) with favorable alloy geometry (diameter up to 3 mm) exists in the form of alloys with a content of approximately 65%-75% magnetic elements [15][16][17][18].The process of magnetizing amorphous alloys does not differ significantly from their crystalline counterparts. Figure 1 shows a diagram of the primary magnetization cur...

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“…Boron was added in the form of a pre-prepared FeB alloy with the chemical composition Fe 45.4 B 54. 6 . The production process was carried out under a protective atmosphere of argon.…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

The Process of Magnetizing FeNbYHfB Bulk Amorphous Alloys in Strong Magnetic Fields

et al. 2020

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“…Very low peaks are observed at the 2Theta angles (~4.0, 5.6, and 7.0 degrees) that indicate the presence of a negligible amount in the primary α-(Fe,Co) phase. Han et al investigated the influence of boron addition on the structure of ribbons and showed the two-phase structure of Fe 67 Co 20 B 13 as-spun ribbon [22]. The differential scanning calorimetry (DSC) curve ( Figure 2b) recorded on heating for Fe 67 Co 20 B 13 as-spun ribbon showed the two-stage crystallization process.…”

Section: Methodsmentioning

confidence: 99%

Fe-Co-B Soft Magnetic Ribbons: Crystallization Process, Microstructure and Coercivity

et al. 2020

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In this work, a detailed microstructural investigation of as-melt-spun and heat-treated Fe67Co20B13 ribbons was performed. The as-melt-spun ribbon was predominantly amorphous at room temperature. Subsequent heating demonstrated an amorphous to crystalline α-(Fe,Co) phase transition at 403 °C. In situ transmission electron microscopy observations, carried out at the temperature range of 25–500 °C and with the heating rate of 200 °C/min, showed that the first crystallized nuclei appeared at a temperature close to 370 °C. With a further increase of temperature, the volume of α-(Fe,Co) crystallites considerably increased. Moreover, the results showed that a heating rate of 200 °C/min provides for a fine and homogenous microstructure with the α-(Fe,Co) crystallites size three times smaller than when the ribbon is heated at 20 °C/min. The next step of this research concerned the influence of both the annealing time and temperature on the microstructure and coercivity of the ribbons. It was shown that annealing at 485 °C for a shorter time (2 s) led to materials with homogenous distribution of α-(Fe,Co) crystallites with a mean size of 30 nm dispersed in the residual amorphous matrix. This was reflected in the coercivity (20.5 A/m), which significantly depended on the volume fraction of crystallites, their size, and distribution.

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“…Materials exhibiting soft magnetic properties are characterized by a low-value coercive field, low core losses and high saturation magnetization. Such properties are exhibited, among others, by amorphous [1][2][3][4][5][6] and nanocrystalline iron-based alloys [7][8][9][10]. These parameters are especially important for such applications as magnetic cores, where efficient demagnetization is required.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Effect of Thermal Treatment on the Obtaining of Magnetic Phases: Fe5Y, Fe23B6, Y2Fe14B and αFe within the Amorphous Matrix of Rapidly-Quenched Fe61+xCo10−xW1Y8B20 Alloys (Where x = 0, 1 or 2)

et al. 2020

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The paper presents the results of research on the structure and magnetic properties of Fe61+xCo10−xW1Y8B20 alloys (where x = 0, 1 or 2). The alloys were produced using two production methods with similar cooling rates: Injection casting and suction casting. The alloy samples produced were subjected to isothermal annealing at 940 K for 10 min. The structure of the materials was examined using X-ray diffraction. Isothermal annealing has led to the formation of various crystallization products depending on the chemical composition of the alloy and the structure of the alloy in a solidified state. In two cases, the product of crystallization was the hard magnetic phase Y2Fe14B. However, the mechanism of this phase formation was different in both cases. The magnetic properties of alloys were tested using a vibrating sample magnetometer and a Faraday magnetic balance. It is found that the grain crystallite size of the crystalline phases have a decisive influence on the value of the coercive field (especially in the case of hard magnetic phases). It has been shown that privileged areas can already be created during the production process. Their presence determines the crystallization process.

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Softening and good ductility for nanocrystal-dispersed amorphous Fe–Co–B alloys with high saturation magnetization above 1.7 T

Cited by 47 publications

References 34 publications

The Process of Magnetizing FeNbYHfB Bulk Amorphous Alloys in Strong Magnetic Fields

The Process of Magnetizing FeNbYHfB Bulk Amorphous Alloys in Strong Magnetic Fields

Fe-Co-B Soft Magnetic Ribbons: Crystallization Process, Microstructure and Coercivity

Investigation into the Effect of Thermal Treatment on the Obtaining of Magnetic Phases: Fe5Y, Fe23B6, Y2Fe14B and αFe within the Amorphous Matrix of Rapidly-Quenched Fe61+xCo10−xW1Y8B20 Alloys (Where x = 0, 1 or 2)

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